When Sun is burying the bottle of messages in the sand, she digs a hole, picks up the bottle and has no wedding ring on her hand. After a cut to her face, there's a close shot of the bottle in her hands again, and the ring is visible. She puts the bottle in the sand and buries it and her ring is once again missing.
During the beginning of the scene when Sawyer gets pulled up out of the pit, in the low shots the sky behind Mr. Eko and the others changes from bright to dusky.
In the flashback plot, Hugo is shown with his winning lottery ticket still in hand and has yet to cash it in, when he decides to quit his job at Mr. Cluck's and hang out with his best friend one more time before "everything changes". Yet, when they stop by the convenience store where Hugo purchased the winning ticket and find the local TV crew filming a news segment about the lottery winner, the clerk identifies Hugo as the winner. Even if he had already claimed the prize, the convenience store clerks would have no way of knowing who purchased the winning ticket. Lottery winners remain anonymous when claiming the winning prizes until they choose to go public.